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Message-ID: <20250806022045.342824-5-ziy@nvidia.com>
Date: Tue, 5 Aug 2025 22:20:45 -0400
From: Zi Yan <ziy@...dia.com>
To: David Hildenbrand <david@...hat.com>,
linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
Zi Yan <ziy@...dia.com>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
"Liam R. Howlett" <Liam.Howlett@...cle.com>,
Nico Pache <npache@...hat.com>,
Ryan Roberts <ryan.roberts@....com>,
Dev Jain <dev.jain@....com>,
Barry Song <baohua@...nel.org>,
Vlastimil Babka <vbabka@...e.cz>,
Mike Rapoport <rppt@...nel.org>,
Suren Baghdasaryan <surenb@...gle.com>,
Michal Hocko <mhocko@...e.com>,
Shuah Khan <shuah@...nel.org>,
linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org
Subject: [PATCH 4/4] selftests/mm: check after-split folio orders in split_huge_page_test.
Instead of just checking the existence of PMD folios before and after folio
split tests, use check_folio_orders() to check after-split folio orders.
The following tests are not changed:
1. split_pte_mapped_thp: the test already uses kpageflags to check;
2. split_file_backed_thp: no vaddr available.
Signed-off-by: Zi Yan <ziy@...dia.com>
---
.../selftests/mm/split_huge_page_test.c | 67 +++++++++++++------
1 file changed, 46 insertions(+), 21 deletions(-)
diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/testing/selftests/mm/split_huge_page_test.c
index 3c761228e451..cd34000279fe 100644
--- a/tools/testing/selftests/mm/split_huge_page_test.c
+++ b/tools/testing/selftests/mm/split_huge_page_test.c
@@ -25,6 +25,10 @@
uint64_t pagesize;
unsigned int pageshift;
uint64_t pmd_pagesize;
+unsigned int pmd_order;
+unsigned int max_order;
+
+#define NR_ORDERS (max_order + 1)
#define SPLIT_DEBUGFS "/sys/kernel/debug/split_huge_pages"
#define SMAP_PATH "/proc/self/smaps"
@@ -38,6 +42,11 @@ uint64_t pmd_pagesize;
#define KPF_THP (1UL<<22)
#define GET_ORDER(nr_pages) (31 - __builtin_clz(nr_pages))
+const char *pagemap_proc = "/proc/self/pagemap";
+const char *kpageflags_proc = "/proc/kpageflags";
+int pagemap_fd;
+int kpageflags_fd;
+
int is_backed_by_thp(char *vaddr, int pagemap_file, int kpageflags_file)
{
uint64_t paddr;
@@ -153,6 +162,7 @@ void split_pmd_thp_to_order(int order)
char *one_page;
size_t len = 4 * pmd_pagesize;
size_t i;
+ int orders[NR_ORDERS];
one_page = memalign(pmd_pagesize, len);
if (!one_page)
@@ -174,6 +184,12 @@ void split_pmd_thp_to_order(int order)
if (one_page[i] != (char)i)
ksft_exit_fail_msg("%ld byte corrupted\n", i);
+ memset(orders, 0, sizeof(int) * NR_ORDERS);
+ orders[order] = 4 << (pmd_order - order);
+ if (check_folio_orders((uint64_t)one_page >> pageshift,
+ len >> pageshift, pagemap_fd, kpageflags_fd,
+ orders, NR_ORDERS))
+ ksft_exit_fail_msg("Unexpected THP split\n");
if (!check_huge_anon(one_page, 0, pmd_pagesize))
ksft_exit_fail_msg("Still AnonHugePages not split\n");
@@ -188,22 +204,6 @@ void split_pte_mapped_thp(void)
size_t len = 4 * pmd_pagesize;
uint64_t thp_size;
size_t i;
- const char *pagemap_template = "/proc/%d/pagemap";
- const char *kpageflags_proc = "/proc/kpageflags";
- char pagemap_proc[255];
- int pagemap_fd;
- int kpageflags_fd;
-
- if (snprintf(pagemap_proc, 255, pagemap_template, getpid()) < 0)
- ksft_exit_fail_msg("get pagemap proc error: %s\n", strerror(errno));
-
- pagemap_fd = open(pagemap_proc, O_RDONLY);
- if (pagemap_fd == -1)
- ksft_exit_fail_msg("read pagemap: %s\n", strerror(errno));
-
- kpageflags_fd = open(kpageflags_proc, O_RDONLY);
- if (kpageflags_fd == -1)
- ksft_exit_fail_msg("read kpageflags: %s\n", strerror(errno));
one_page = mmap((void *)(1UL << 30), len, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
@@ -261,8 +261,6 @@ void split_pte_mapped_thp(void)
ksft_test_result_pass("Split PTE-mapped huge pages successful\n");
munmap(one_page, len);
- close(pagemap_fd);
- close(kpageflags_fd);
}
void split_file_backed_thp(int order)
@@ -471,6 +469,7 @@ void split_thp_in_pagecache_to_order_at(size_t fd_size, const char *fs_loc,
size_t i;
char testfile[INPUT_MAX];
int err = 0;
+ int orders[NR_ORDERS];
err = snprintf(testfile, INPUT_MAX, "%s/test", fs_loc);
@@ -482,12 +481,21 @@ void split_thp_in_pagecache_to_order_at(size_t fd_size, const char *fs_loc,
return;
err = 0;
- if (offset == -1)
+ memset(orders, 0, sizeof(int) * NR_ORDERS);
+ if (offset == -1) {
write_debugfs(PID_FMT, getpid(), (uint64_t)addr,
(uint64_t)addr + fd_size, order);
- else
+ orders[order] = fd_size / (pagesize << order);
+ } else {
+ int times = fd_size / pmd_pagesize;
+
write_debugfs(PID_FMT_OFFSET, getpid(), (uint64_t)addr,
(uint64_t)addr + fd_size, order, offset);
+ for (i = order + 1; i < pmd_order; i++)
+ orders[i] = times;
+
+ orders[order] = 2 * times;
+ }
for (i = 0; i < fd_size; i++)
if (*(addr + i) != (char)i) {
@@ -496,6 +504,12 @@ void split_thp_in_pagecache_to_order_at(size_t fd_size, const char *fs_loc,
goto out;
}
+ if (check_folio_orders((uint64_t)addr >> pageshift,
+ fd_size >> pageshift, pagemap_fd, kpageflags_fd,
+ orders, NR_ORDERS))
+ ksft_exit_fail_msg("Unexpected THP split\n");
+
+
if (!check_huge_file(addr, 0, pmd_pagesize)) {
ksft_print_msg("Still FilePmdMapped not split\n");
err = EXIT_FAILURE;
@@ -526,7 +540,6 @@ int main(int argc, char **argv)
const char *fs_loc;
bool created_tmp;
int offset;
- unsigned int max_order;
unsigned int nr_pages;
unsigned int tests;
@@ -543,6 +556,7 @@ int main(int argc, char **argv)
pagesize = getpagesize();
pageshift = ffs(pagesize) - 1;
pmd_pagesize = read_pmd_pagesize();
+ pmd_order = GET_ORDER(pmd_pagesize / pagesize);
if (!pmd_pagesize)
ksft_exit_fail_msg("Reading PMD pagesize failed\n");
@@ -551,6 +565,14 @@ int main(int argc, char **argv)
tests = 2 + (max_order - 1) + (2 * max_order) + (max_order - 1) * 4 + 2;
ksft_set_plan(tests);
+ pagemap_fd = open(pagemap_proc, O_RDONLY);
+ if (pagemap_fd == -1)
+ ksft_exit_fail_msg("read pagemap: %s\n", strerror(errno));
+
+ kpageflags_fd = open(kpageflags_proc, O_RDONLY);
+ if (kpageflags_fd == -1)
+ ksft_exit_fail_msg("read kpageflags: %s\n", strerror(errno));
+
fd_size = 2 * pmd_pagesize;
split_pmd_zero_pages();
@@ -575,6 +597,9 @@ int main(int argc, char **argv)
split_thp_in_pagecache_to_order_at(fd_size, fs_loc, i, offset);
cleanup_thp_fs(fs_loc, created_tmp);
+ close(pagemap_fd);
+ close(kpageflags_fd);
+
ksft_finished();
return 0;
--
2.47.2
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